I do a lot of daygame, and oftentimes I have found it hard to open a girl. I have tried many different lines, and the one that is most receptive is when I say "I believe in a yolo lifestyle..." And then ask them out. Here is an example:

Me: "Well it was nice to meet you. Do you know yolo? Well I believe in a yolo lifestyle and it would be remiss of me if I didn't say you are beautiful. Would you like to get drinks sometime?"

Going up to a girl in broad daylight is hard enough, and saying you believe in yolo shows you are the adventurous type who is not afraid to go for what you want.